Demon Princes
The Demon Princes is a five-book series of science fiction novels by Jack Vance, which cumulatively relate the story of one Kirth Gersen as he exacts his revenge on five notorious criminals, collectively known as the Demon Princes, who carried the people of his village off into slavery during his childhood. Each novel deals with his pursuit of one of the five Princes.
Book titles
The titles, Gersen's antagonists, and a few details of their plots, in order of publication:
The Star King (1964). The antagonist is Attel Malagate, a renegade from a species called the Star Kings, who are driven to imitate and surpass the most successful species they encounter; with their contact with humanity in antiquity, they began consciously evolving into imitations of human beings. The bait Gersen uses to trap him is an undeveloped and fantastically beautiful planet whose location is known only to Gersen, which Malagate covets to become the father of a new race that can outdo both humans and his own species.